Metal-dielectric structures for high charge state ion production in ECR plasma

Metal-dielectric (MD) structures of pure (99.999%) aluminum foils were previously studied [1, 2] in the National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania showing high secondary electron emission properties. Consequently, 26 mm diameter disks of such structures (Al-Al2O3) were tested in the ECR ion source of the Institut fuer Kernphysik (IKF) der J. W. Goethe Universitat, Frankfurt/Main, Germany, allowing to demonstrate their ability to significantly increase the ECRIS performances in what concerns the production of high charge state ions [3]. New experiments carried on in Bucharest on a special facility [2] stressed out the possibility to develop high emissive MD structures starting from lower purity (99%) aluminum foils. This result allowed us to make a special cylinder of 1 mm wall thickness electrolytically treated so that only the inner face had a MD structure layer while the external surface remained metallic. Such a cylinder introduced in the plasma chamber of an ECR ion source provides a high rate of secondary electrons that enhance the ECR plasma electron density while its metallic external surface provides a good electric and thermal contact with the plasma chamber. The tests performed with such a MD aluminum cylinder in the IKF 14 GHz ECR ion source, successfully demonstrated the possibility to shift the ECRIS output toward very high charge states (Ar16+) due to the strong secondary electron emission of the MD inner surface of the cylinder

Formation of F

Formation conditions, optical nonlinear properties and applications of F2− color centers in LiF monocrystals are investigated. The efficiency of F2− centers generation depending of irradiation conditions and content of OH− impurities of the LiF monocrystal are also presented. Thermal stability of the centers generated by electron irradiation was studied. It was measured the variation of absorption factor of the LiF: F2− crystal in the −40 °C to 60 °C temperature range. The LiF: F2− crystals obtained by an efficient method of irradiation with electrons generated by a linear accelerator were employed in Q-switching a Nd: YAG laser cavity with output energies of 18 mJ and fluctuations less than 5% in the −40 °C to 60 °C temperature range

Anatomic-surgical study on the interparietoperitoneal space from a laparo-endoscopic perspective

The interparietoperitoneal (IPP) space, by a broad definition, is the space between the musculo-fascial walls of the abdomen and the parietal peritoneum. A review of the literature on this subject has been performed through a search in the databases according to the following keywords: Bogros space, Retzius space, preperitoneal approach, and urogenital fascia. We have also analyzed the video recordings of the dissections of the inguinopreperitoneal region during TAPP, conducted by a single team, evaluating the dissection planes in the two compartments (medial and lateral) of the IPPS. Based on the latest data from the literature, as well as on our own experience in laparo-endoscopic herniation surgery, we aim to provide answers to several questions. IPPS from the inguinal region is an area as complex as it is narrow, but of great current surgical interest (approaches of hernias, vessels, prostate). The fascial distribution has its origin in the embryological development of the urogenital apparatus. The basic fascial structure in understanding IPPS compartmentalization is the UGF, along with its extensions.</jats:p